Good morning các em, I still am a bit slow like usual but below are a few key points while you're waiting for the full post. I do appreciate your patience with this old man. ;)
Be aware that once again we are the Church ourselves (the body to be specific), Jesus is the head, and the Spirit is the soul. So where does the Father fit in, you ask? He's the planner or creator, or the reason why you and me or the Church exist.
What is God's plan and why there is the Church? Well it's the same reason why we're on this earth, or the creation. We exist because "someone" from above loves us and wants to share the divine life with us; and his plan opens to everyone who accepts and follows Jesus, so the Church or we are here to help God make it happen. Honored? Good!
Lots to learn from the Elephant and the Blind Men poem/story (bottom of page 105).
Understand the 4 marks about the Church (which can be found in Kinh Tin Kính, which we read in every Sunday mass), and know that our common goal from this day until the day we die is try to become as holy as we can (that's what "the Holy" calls us to be).
Last but not least, as you go through your life, don't ever stop praying so that you can be able to see what your gifts are. If you don't know what gifts I'm talking about, here is a friendly reminder. :)